The seven-month downturn in Indian services sector activity eased in January but input prices continued their relentless climb, heaping further pressure on the Reserve Bank of India, a survey showed on Wednesday.

The HSBC Services Purchasing Managers' Index (PMI) , compiled by Markit, rose to 48.3 in January from 46.7 in December. While the reading is the highest in seven months, it has been stuck below the 50 mark that separates growth from contraction for just as long.

In contrast to the services PMI, a sister survey on Monday showed Indian factories had a good start to 2014 with activity growing at its quickest pace in nearly a year.

Input prices rose at their quickest pace in three months and firms again passed some of those rising costs on to customers, albeit at a slightly slower rate than in December.

The input prices subindex leapt to 54.7 from 52.8. This adds to India's existing worries including a slowdown in economic growth, fragile global demand for the country's goods and services, and more recently, a selloff in emerging markets as the US Federal Reserve tapers its stimulus. Late last month, the RBI surprised markets by raising the repo rate to 8% to battle inflation.

India's consumer price inflation eased to a three-month low in December and the RBI said at its January meeting it was unlikely to hike rates again if retail inflation eased as expected.